Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf617b080085d46…

MALICIOUS

PDF

102.8 KB Created: 2021-07-05 13:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4abf586e9fdbe3cbf79f7727f75016ca SHA-1: 2d551cd756f8557b3b0df323229248159d3071e2 SHA-256: 0bf617b080085d4640d9743f3464415d9d3f154c785746cb06fc180aa7dbf2ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for SEO manipulation or to host malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=vegetable+oil+melting+point+and+boiling+point PDF link annotation
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/pumisaturumeb.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad074db8c01---garexugilujiwe.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acd92f814ea---85328314902.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89ba9fb5c0cf4e100387b395182d4529/tujamugo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e902147e7---56975981868.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2ff70c5b1f6bec5fbeee2924f30bcf63/genadafexojevulirowof.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ab2bb5b14---koxujoxeme.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/pusenolopamolade.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071659057db7---jofoz.pdfIn PDF document text
    • http://ewtch.com/upload/files/27075083149.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/xemuruv.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7799bdc8ebb7e37ce434894029fd2e6d/37674367184.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d809238df81---70839134540.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061801315881.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d4424dd4---sajobusadetuf.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaaae53b2---narabonozufogumopez.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2fd8dcee7---ganavelumoripaturabifuzo.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/14631698936.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tiposejawivewolufite.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/slap2i05rlvc3rsqmsd84b8d4s/47534359047.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/20490149683.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/42850931357.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/16778718729.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14632 10576 bytes
SHA-256: 3c4d39cb21dbc23a866676e9266e2766bbced8877f7809ec9801a727b3bebc34
font_02_sfnt_off00015dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD4 18252 bytes
SHA-256: 60cdc425800e8354837448f7276ec358ec99e2a4e915154ce7a8a4f128c80fcc

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